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Base anchor pulling capability’s vs isolated fork


TTownsend
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36 minutes ago, carlos said:

we nearly always throwline through a fork and tie down the back at the base, seems to work fine and a lot easier than climbing.

 

Same here but on critical, large or back leaning trees it's worth keeping in mind you'll need more pulling force with a base anchor tie off than you would with an isolated  fork. 

 

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I agree it is possible to sum the two rope force vectors to get the red one, but as this is the sum of two forces the red force is bigger than the rope tension.

The force across the stump to pull the tree over is exactly the same.

I would consider it from the digger end, a certain pull on the rope has to be resisted by the tree no matter how it's tied on, what changes is the loading within the wood.

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See Tim, we were both right!

 

I must admit when we were pulling some big leaning pops over beside a caravan park each tree was climbed and the wire chokers placed round the stem at exactly the point directed by the bloke with the 35 tonne winch.

 

No margin for error or snap outs.

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To me as a non-Arb person, a world of difference in these 2 techniques, in that I would not dream of flipping a line through a crotch/fork and tying off at the base, I dont know why, but I would always, but always climb, however inelegantly, and most probably using ladders and tie off at the choosen pulling point.

Simple farmers son applied mechanics at work.

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